New Products

Lightn. Curr. Arr. Type 1
DEHNbloc ® Maxi S
Coordinated lightning current arrester for busbars
Coordinated Type 1 Lightning Current Arresters
• Combination of spark gap and integrated back -
up fuse
• Directly mounted onto PEN/N busbars
• Low voltage protection level U P ≤ 2.5 kV (in -
clud ing 80 cm connecting cable)
• Directly coordinated with DEHNguard surge
protective device without additional cable
length
• Short-circuit withstand capability of 100 kA rms
(220 kA peak )
• High follow current extinguishing capability
and limitation due to RADAX Flow technology
• High lightning current discharge capacity
• With optical-fibre interface for SPD monitoring
For protecting low voltage consumer’s installations against surges and
even direct lightning strikes. For installation in conformity with the lightning
protection zones concept at the boundaries from 0 A – 1.
DEHNbloc Maxi 1 255 S: Coordinated lightning current arrester with integrated arrester backup fuse for busbars
DEHNbloc Maxi S arresters can be easily integrated into the application
environment of a low-voltage switchgear installation or distribution
board.
Thanks to their unique mechanical design, the coordinated DEHNbloc
Maxi S lightning current arresters can be mounted directly onto the
PEN/N busbar of a switchgear installation without the need for additional
adapters.
With the backup fuse integrated in the device, no other separate backup
fuses need to be installed.
Installing the DEHNbloc Maxi S devices directly into the connection panel
of a switchgear installation upstream of the circuit breaker ensures short
cable lengths of the arresters and a low voltage protection level for the
installation.
With a discharge capacity of 25 kA (10/350 μs), DEHNbloc Maxi S fulfils
the most stringent requirements of national and international lightning
protection standards for all three-phase current applications in TN and TT
systems.
For “3+1“ circuit configurations, DEHNgap Maxi S provides a powerful
creepage discharge spark gap with a discharge capacity of 100 kA
(10/350 μs).
DEHNbloc Maxi S also features patented RADAX Flow follow current limitation,
thus ensuring selectivity even in case of low-value fuses.
The capability to conduct lightning impulse currents without destruction
and suppress mains follow currents without tripping upstream overcurrent
protective devices ensures the availability of the switchgear installation
in the event of a lightning strike. This considerably reduces the risk
of arc formation in the installation.
In conjunction with the DEHN -
signal remote signalling system,
the operating state of DEHNbloc
Maxi S devices can be monitored
at any time.
Easy-to-implement optical transmission
to the DEHNsignal E 3
remote signalling receiver module
ensures safe electrical isolation
between the power circuit
and the remote signalling circuit.
"3+1" Application in a TT/TN-S system
"3-0" Application in a TN-C system
*) DEHbloc Maxi S
DBM 1 255 S
main circuit breaker
main circuit breaker
**) DEHNgap Maxi S
DGPM 1 255 S
L1
L2
L3
plastic LWL DSI
optical fibre cable
max. 6 m
TT / TN-S
DSI E 3
power supply
S N L
*) DEHbloc Maxi S
DBM 1 255 S
L1
L2
L3
plastic LWL DSI
optical fibre cable
max. 6 m
TN-C
DSI E 3
power supply
S N L
N busbar
**)
*)
*)
*)
without
wire
jumper
S/N
N L
*) *)
*)
with
wire
jumper
S/N
N L
(PEN)
PEN busbar
N' N L
PE busbar
DEHNgap Maxi S
DGPM 1 255 S
N' N L
equipotential bonding
!
All three optical fibre cables
must be connected!
F
L
N
Application in a TT / TN-S system
power supply
230 V~
max. 16 A gl/gG
(C 16 A)
equipotential bonding
!
All three optical fibre cables
must be connected!
Application in a TN-C system
F
L
N
power supply
230 V~
max. 16 A gl/gG
(C 16 A)
58 www.dehn.de